

A271752


Number of set partitions of [n+1] such that n is the largest element of the last block.


2



0, 1, 4, 15, 59, 250, 1145, 5649, 29874, 168509, 1009215, 6391484, 42648083, 298865333, 2193219124, 16811408659, 134289313167, 1115559002906, 9619253991637, 85950089855573, 794567157607386, 7588822028424393, 74783864494826723, 759461721024357540
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OFFSET

1,3


LINKS



FORMULA



EXAMPLE

a(3) = 4: 1243, 1423, 1423, 1243.
a(4) = 15: 12354, 12534, 12534, 12354, 13524, 13524, 13254, 15234, 15234, 12354, 15234, 12534, 15234, 12534, 12354.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



